Summary:
This is the proof of concept for the initial landing page for RocksDB when we move to GitHub pages.
The images for each feature can change, but using these as placeholders for now.
The styling may change a bit as well.
Test Plan: Visual
Reviewers: IslamAbdelRahman, lgalanis, sdong
Reviewed By: lgalanis
Subscribers: andrewkr, dhruba, leveldb
Differential Revision: https://reviews.facebook.net/D62985
